/*
 * Copyright (c) 2017 AsyncHttpClient Project. All rights reserved.
 *
 * This program is licensed to you under the Apache License Version 2.0,
 * and you may not use this file except in compliance with the Apache License Version 2.0.
 * You may obtain a copy of the Apache License Version 2.0 at
 *     http://www.apache.org/licenses/LICENSE-2.0.
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the Apache License Version 2.0 is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the Apache License Version 2.0 for the specific language governing permissions and limitations there under.
 */
package org.asynchttpclient.oauth;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import org.asynchttpclient.util.StringBuilderPool;

class Parameters {

    private List<Parameter> parameters = new ArrayList<>();

    Parameters add(String key, String value) {
        parameters.add(new Parameter(key, value));
        return this;
    }

    void reset() {
        parameters.clear();
    }

    String sortAndConcat() {
        // then sort them (AFTER encoding, important)
        Collections.sort(parameters);

        // and build parameter section using pre-encoded pieces:
        StringBuilder encodedParams = StringBuilderPool.DEFAULT.stringBuilder();
        for (int i = 0; i < parameters.size(); i++) {
            Parameter param = parameters.get(i);
            encodedParams.append(param.key).append('=').append(param.value).append('&');
        }
        int length = encodedParams.length();
        if (length > 0) {
            encodedParams.setLength(length - 1);
        }
        return encodedParams.toString();
    }
}
